Posted on in uncategorized
Sometimes your wonderful Amazon Kindle may get hung and need a little help. How to go about issuing a hard or soft reset depends on which version of the Kindle you have.
Soft Reset: Hold down Alt-Shift-R
Hard Reset: Remove the back cover and insert a paperclip …
Posted on in System Administration
The default username and password for all versions of Cisco Access Registrar (as of version 5.0):
Username: admin
Password: aicuser
Perhaps this will save you a little time someday.
Posted on in System Administration
Note: This post is a natural continuation of my post Command Logging is Vital to System Administration.
The primary purpose of sudo is to allow system administrators to execute
commands as the superuser (AKA root). It allows a group of people to manage a
system without the hassle of keeping …
Posted on in Networking
In the following example, I'm going to set up a Simple Network Management Protocol version 3 (SNMPv3) user on a Cisco router with limited view of the system MIB.
Create an SNMP view that limits the user to the system MIB.
ROUTER(config)# snmp-server view SYSTEM system included
Create an …
Posted on in Software
I use Unison to keep a few directories synchronized between my various workstations and a collocated server. Unison works great, but occasionally has problems in my mixed operating system environment. The most frequent problem is
Failed: Destination updated during synchronization
This error message is not very helpful at all. Newer …
Posted on in Software
After all this time, I still love VirtualBox, the open source hypervisor from Sun (now Oracle). I use it almost everyday on my iMac to either test something in Windows XP or see what's going on in some version of Linux. It's been almost a year since the release of …
Posted on in System Administration
If you're using Red Hat Enterprise Linux (RHEL) or one of it's variants (CentOS,
etc.), you may have noticed that using a non-standard document root for your
Apache-based web site results in a DocumentRoot does not exist warning if
the directory exists. The most likely cause of this problem is …
Posted on in voice
It's not often that I have to restart a Asterisk VoIP PBX. I recently upgraded to the latest version of Asterisk 1.4. After the installation was complete, I restarted the service and everything appeared to be functioning OK. Processes were running and owned by the asterisk user. When I …
Posted on in Networking
In this case, gentlemen, size matters.
Yesterday, I calculated the average packet size for one of the networks I work on using data from 263986M (263,986,000,000+) packets.
Average packet size for that sample was 557 bytes.
Posted on in voice
Protocol Basics
Layer: Application
Transport: <acronym title="Transmission Control Protocol">TCP</acronym> or <acronym title="User Datagram Protocol">UDP</acronym>
Port(s): 5060, 5061
RFC(s): 2543, 3261
SIP is by far the most popular protocol used in VoIP communication today. SIP was designed as a …
Posted on in System Administration
If you have an interest in information security from a technical or managerial point of view, check out Principles of Information Security. It does an excellent job of presenting material for both audiences.
If you have other vendors you would like to see on this list, send me a message …
Posted on in Software
Somehow, I have let my Gmail inbox get totally out of control. I don't know if it was the holidays or what, but as of this morning, I had over 800 unread messages in my Gmail inbox. I decided a little while ago that it was time to focus on …
Posted on in Software
Importing Mozilla Firefox bookmarks into Safari on your Mac is really easy. Firefox stores its bookmarks in an HTML file that can be parsed by Safari. In Safari, simply click on the File menu and select Import Bookmarks. This will open a file selection dialog box. Firefox stores its bookmarks …
Posted on in System Administration
Previously, I mentioned that I was unable to remove the FAX= portion of the string produced by Cisco's $s$ (or $d$) macro in a T.37 store and forward fax configuration. That's still the case. I have found no way of doing this inside IOS. If it's possible, I've …
Posted on in Programming
If you get this error when trying to save something in the Django admin, it's probably because you forgot to synchronize the database after adding the admin application. If you are using a pre-1.2 version of Django, you can simply:
$ ./managy.py syncdb
Django 1.2 (which is currently …
